难控制的

The mechanism of lock corridor crack is rather complicated due to the unique structure of corridor. As a result construction technique improvement cannot totally eliminate corridor crack occurrence. According to the construction process and results of Jinghang Cannel Huaiyin 3rd Lock,certain technical measures and improvements in construction techniques,can efficiently control the corridor crack and avoid the occurrence of crack as much as possible.

船闸廊道裂缝的产生机理较为复杂，由于廊道独特的结构形式，仅仅从改善施工工艺方面来完全消除廊道裂缝的出现是很难的，从本次京杭运河淮阴三线船闸工程实施过程及结果来看，通过一定的技术措施和改善施工工艺，可使廊道裂缝得到有效的控制，同时避免了有害裂缝的产生。

Induction heating furnace is a complex delay system.Exact mathematical model is not easy to be established.

感应加热炉是一个复杂的非线性大滞后系统，很难建立一个精确的数学模型，用常规的控制方法难以得到满意的效果，而且人工调试比较困难，在扰动比较大的时候，就会远离设定值。

But, in these types of converters, excessive voltage and current stresses occur ,and power density is lower and control is harder than normal PWM converters.

但是， 在转换器的这些类型，过度的电压和现在的压迫力中发生，而且力量密度是比较低的，而且控制是比正常难的 PWM 转换器。

As the innovation of the paying land using system deepening, many academicians have studied intensively on the appraisal of urban benchmark land-value, however, because there is large otherness in all regions of cities, in the idiographic remise and attorn, it is very difficult for the benchmark land-value to guide and control the land price, the influence factors of the land price are complicated and are difficult to be appraised, so the research on the land price appraisal is very little.

随着土地有偿使用制度改革的深入，许多学者对城市基准地价评估工作进行了深入的研究，然而，由于城市内部各区域的差异性很大，在具体的出让、转让活动中，基准地价很难指导、控制宗地地价，而且宗地地价的影响因素复杂，评估困难，因此研究亦少。

But there is a common theme to both results: cross-racial unity in a city that was once staunchly segregationist, and which in more recent times has experienced an uneasy detente between wealthy whites who control most of the city's economic affairs and powerful blacks who run its politics.

虽然很难搞清"圣徒"队的成功和兰德鲁获胜有多大关联，但是两个结果有一个共同的主题：跨种族融合。该城曾是支持种族隔离的顽固派，在更近的时期还经历了一次艰难的关系缓和：一方是控制城市大部分经济事务的富有白人，另一方是掌控政坛的强势黑人。

With its unreformed one-party system, its rote-learning in schools and state control of big businesses,"new China is hardly a haven for innovative thinking.

其未经改革的一党制，学校里死记硬背的学习方法和国家控制了大的商业，"新中国"很难成为创新思维的天堂。

It has been warranted through experiments and practical application that rare-earths-high-aluminium heat-resistant nodular iron has some intrinsic properties which are worthy of reconimandation, namely,that it will not scale after long periods of use at 1050-1100℃, will hardly break while being hammered into castings, runners or risers as the high-temperature tensile strength reaches 14-19 kg/mm2 at 800℃ or≥l3.3kg/mm2 at 900℃, with the room temperature strength close to HT 30-50 and the unnotched impact str...

本文介绍了稀土高铝耐热球墨铸铁的生产实践、化学成分；探讨了稀土作用及其用量和控制；论述了稀土和铝加入方式以及冷却速度对金相组织的影响；并对铸造工艺、铸件缺陷及分析、耐热性能及使用效果作了阐明。试验和使用证明：稀土高铝耐热球墨铸铁在1050～1100℃长时间工作不起氧化皮，热强度800℃时，14～19kg/mm~2，900℃时≥13.3kg/mm~2，室温强度近于HT30—54，a_k≈2～6kg·M/cm~2，锤击铸件或浇冒口，很难碎裂，并能机械加工。可以认为是以我国富产资源为原料，能用各种炉子熔炼、耐热和综合机械性能均较高硅、中硅中铝球铁、高铝片墨铸铁为高的一种耐热铸铁，也是镍铬系耐热材料较好的替代品。

Shanxi's nationalisation drive will disappoint Chinese entrepreneurs, who have long hankered after bigger opportunities in industries, such as resource extraction, that are still dominated by the state.

山西的国有化政策让中国的企业家们难掩失望，他们长期一来都希望在资源开采这样的产业获得更多的准入机会。这些产业仍然被国有经济所控制。

Can-body seam welding technology is applied to fuze reserve battery's miniaturization design to against the problem that it is difficult to mold liquid storage bottle of thin stainless steel plate.For this purpose,the seam welding power source base on fuzzy PID is designed and the fuzzy rule base is established.The system is simulated using Matlab/Simulink after the system structure is changed.

针对引信电源在小型化结构设计中薄板制不锈钢锂亚硫酰氯储液瓶成型难的问题，提出了罐身缝焊技术在引信储备电源中的应用；设计了基于模糊PID控制电流的缝焊电源，建立了模糊推理规则库；在改变系统结构的情况下，运用Matlab/Simulink仿真软件对系统进行了仿真。

With the improving of winding quality of mechanical and electrical products , winders controlled by PLC have not been satisfacted with the mechanical and electrical prouducts needs .

随着机电产品对绕组质量要求的提高，原有的PLC控制系统的绕线机已很难满足不断发展的机电产品的要求。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。